Today I chang my timing belt on my 93 maxima gxe. The water pump has been leaking for a couple of months, and the west thing is the coolant and some kind of oil made all the marks gone, incluing that of belt and the sprocket, that really messed up. So I want know how to determine the timing of the cam and crank position, set tdc etc.
thanks!

 

All the sprockets have little dots pressed (or molded) into the metal shoing where to line the belt up with. There is a mark pressed into the rea timing belt cover to line the cam sprockets with.

Also line of the pressed dot on the crank cam with the mark on the oil pump and you will have TDC.